The 24-year-old striker has joined the Italian giants on a season-long loan from Arsenal.
Bendtner spent last season on loan at Sunderland.
Bendtner tweets: "I can now finally say I am a Juventus player. Very proud and can't wait to wear the stripes! I hope we will have great times together.
"I want to fulfil my potential here and show the fans my absolute best as that is yet to come. I am sure I will.
"Thanks for all the support from the Arsenal fans and the Sunderland fans, means the world. We always believe and that gets us far!"
Sporting director, Beppe Marotta told Sky Sport Italia: "Bendtner is already in Italy and will undergo a medical.
"Until the final paperwork is concluded, I will not say that the player is ours.
"He has talent and ability. Potentially a great player, one that has almost never been able to prove it."